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Every other year or so. It's just a flawed design. For every story like yours there's a legion of folks who's Grenade Locks blew up, stopped working, or in some rare cases, locked up solid like a spool.

...or they get old in half ton axles. I had one in a '86 K5 with 1xx,xxx miles on it about ten years ago and in a 92 Blazer K1500 from 98-02 and I've now learned that neither worked. I always thought they were an ineffective limited slip. It wasn't until I was told how they operate that I...

AKA The Grenade Lock AKA The Gov-Bomb AKA That worthless POS...

Posi = limited slip. It's just a marketing term that's been taken into popular culture and bastardized a bit as to it's proper usage. There's a few different types of limited slips in how they work but basically they all will evenly split power when both wheels have traction but as soon as one...

Nope, it's a Dana unit...I think the Tracsomething...forget which. The milder of the two Dana limited slips. Don't think the TruTrac even existed back then. For the record posi is just a former GM brand name for a limited slip. The use of the term posi to designate anything other than a...